Compositions

Hooks + Project Instructions

Instructions explain the rule and remediation. A hook checks the observable invariant. Keep the language and executable test aligned from one policy source.

Hooks + Skills

A hook can recommend or route to a remediation skill after a failure. Avoid letting the hook trigger an unbounded model workflow on every event; preserve a clear operator-visible transition.

Hooks + MCP

Use hooks to log or constrain MCPMCPUSB-C for AI — one standard plug so any agent can connect to any data source or tool.The Model Context Protocol: an open standard (Anthropic, 2024) for connecting AI systems to external tools and data without building a custom integration for each one.Full definitionClose tool calls where the runtime exposes them. Enforce credentials, scopes, and service-side authorization at the MCP server or downstream API as well.

Hooks + Subagents

Verify whether child agents inherit hook configuration and whether events identify the originating agentAgentA worker you delegate to: brief it, and it takes steps on its own. A chatbot answers; an agent acts.An LLM that runs tools in a loop toward a goal — it acts, checks the result, decides the next step, and repeats until done.Full definitionClose. A parent-only hook leaves a blind spot if children can act directly.

Hooks + Evidence Ledger

Record event type, normalized action, handler version, decision, result, timestamp, and causal run identifier. Store evidence outside the mutable agent conversation.

Hooks + Release Gate

The hook provides fast local feedback; CI repeats the check against the complete change; an independent policy layer authorizes release. This composition survives model error, local bypass, and partial telemetry.